of gttmmebsbach



AMarch 11,*1930. L. STEINMULLER TRAVELING GRATE 'Filed Sept. 28, 192!I Patented Mar. 11, 1930 lUm'rau s'rA'rr-:s

LEBnEcH'r STEINMLLER, or eummnnsnacn, GERMANY, asesinaron.y fro fran FIRM I.. a c. srnrnmnnnmor GUMMnnsBAcH/RHEINLAND, annum PATENT OFFICE TRAVELING GRATE Application lled September 28, 1928, Serial No. 309,061, and in Germany August 29, 1928.

My invention relates to improvements in traveling grates. In traveling grates and more particularly in grates of great breadth .it is diilicult to observe the layer of fuel from the side of the furnace and if necessary to stir the same. Therefore, the layer of fuel is burned in an irregular way, and craters are formed therein through which much cold air flows into the combustion chamber. The object of the improvements is to provide a furnace in which the lire can be observed particularly at the end of the rate where the craters are ordinarily forme and in which the fire can be stirred by stirring rods, and with this object in view my invention consists in providing a chamber or assage above the end of the grate from whic the fire can be inspected through peep holes, suitable means being provided for cooling the said chamber.

For the purpose of explaining the invention an example embodying the same has been illustrated in the accompanying drawing -showing a sectional elevation of the rear part of the grate and the adjacent part of the brick work of the furnace.

In the example shown in the drawing the furnace is a part of a steam boiler having a traveling grate a. Above the rear end of the said grate a chamber or passage b is provided which is divided from the combustion chamber by brick work, fand which is closed at the side of the fire by pipes c which serve to cool the chamber and by a wall d of refrac tory material. It will be understood that wa- 'ter or other suitable fluids may be circulated through the pipes c in the usual manner to reduce the amount of heat entering the chamber b from the combustion chamber. The wall of the chamber b located at the side of the fire is inclined downwardly and rearwardly at its bottom end, so that the front wall of the chamber is located above and in front of the wall e providing the end of the combustion chamber. The said inclined part of the wall vof the passage b is formed by bricks f which are loosely placed on the pipes c so that they can be removed for ins ecting and stirring the fire, the said pipes c eing disposed at this part suitable distances apart so as to provide openings 4for the Suitable means are provided for` cooling the passage b. If the heat of the fire is not very high coolin@r by circulation of the air through the open ends of the passage may be sufficient. But ordinarily I provide a pipe ending within the passage and connected with a supply of air, not shown, for blowing the said air into the passage.. In the figure a pipe g has been shown, which may be connected either with a blower for blowing air into the passage, or with a suction pump.

Through the said passage the engineer has access to the rear part of the fire, and he is able to stir the fire, to close any craters which may have been formed, and to break up lumps of slag, so as to expose the coal confined therein to the air and to burn the same. Further, by providing the passage b at the rear end of the traveling grate and above the layer of fuel, the engineer is able to observe the combustion chamber and the whole area of the layer of fuel. More particularly he can observe the side walls of the fire box and cooling pipes which may be provided thereon. Such observation is not always possible in furnaces having broad grates by reason of the thick fiame preventing observation of the side walls.

By thus disposing the passage b for inspection of the fire and for stirring the fuel within the fire box the broad passages heretofore provided between the boilers may be reduced to small dimensions, or they may be entirely dispensed with. Heretofore such passages were necessary for stirring the fire by means of long stirring rods. In my improved construction the engineer is able to stir the lire from the passage b by means of comparatively short stirring rods. Therefore the breadth of the said ,passage b can be reduced as compared to the breadth of the passages provided between adjacent boilers, because the openings for inserting the rods are lo-` catedimmediately above the part of the fire to. be stirred, so that Aonly short rods are needed. Thus, by providing the passage b within the brick work of the boiler much room is saved in the contruction of the whole plant.

passage of the stirring rods.

Inthe foregoing description reference has been made` to boilers provided with traveling grates, for the reason that traveling grates have a large surface area and therefore the passages b are particularly useful. But I wish it to be understood that my invention is not limited to the use in boilers of this class,

and that it may be used in boilers having grates of any construction.

I claim: 1. The combination with a furnace having a grate and a combustion chamber, of an auxiliary chamber extending into said comi bustion chamber over the grate, said auxiliary chamber having openings therein to permit access to the combustion chamber and grate, and means for normally closing said openlngs.

2. The combination with a furnace having a grate and a combustion chamber, of an p auxiliary chamber extending into said combustion chamber over the grate, said auxiliary chamber having openings therein to permit access to the combustion chamber and grate, and means for normally closing said o enings and cooling pipes disposed interme iate said combustion chamber and said auxiliary chamber.

3. The combinationwith a furnace having a grate and a combustion chamber, of an auxiliary chamber extending into said combustion chamber over the grate, said auxiliary chamber having openings therein to permit access to the combustion chamber and grate, and means for normally closing said openings and means for admitting fresh air to said auxiliary chamber to cool the same.

4. Th'e combination With a furnace having a traveling grate and a combustion chamber, of an auxiliary chamber extending Within ne rear portion of said combustion chamber and over said rate, the front wall of said auxiliary cham r being provided with openings to ermit access to said combustion chambei` an grate, means foi normally closing said openlngs, and means for cooling said auxiliaiy chamber.

testimony whereof I hereunto aix my signature.

DB. LEBRECHT STEINMLLER. 

